Barcelona is just lucky that despite their financial predicaments, they still have players who are loyal to the club and are doing perfectly fine if not it wouldn't have been easy for them and moreover, the La Liga they won last season is a good motivation that will enhance their performance next season so even if they don't sign much players due to their financial constraints, they can still manage with the present players and maintain a good form in the La Liga and the Champions League. However, the club's management really made regrettable financial decisions in the past, look at FC Barcelona now, regardless that they won the La Liga last season, it didn't even change anything in their financial system.
Barcelona are a big club and a one with rich history it is normal that they will attract players to join them just like Real Madrid. Their finances might not be stable but they have improved certainly it is a gradual process and I believe they will return back to old status.
The point is that Barcelona was able to become champions in La Liga last season, it is clear because the players they have have very good performance and compactness. In addition, even though Barcelona is not in a good financial condition, we need to remember that Barcelona has La Masia which has always been able to produce very great players until now. So that is why Barcelona can still perform well because of that. And what we should admire is that the players who come from the La Masia academy are always loyal to play in Barcelona. So with that, Barcelona does not lack player resources at all. So even if Barcelona does not make any player purchases, I think they will still be fine. Because the players currently in Barcelona are still very great to be able to compete in the next season. So the point is never to underestimate Barcelona even though basically they are not in a good financial condition. And in my opinion Barcelona's victory in La Liga last season had a very good impact on their finances, so the point is let's just see.